Electrical network



In Figure 4 are Sh0vn SOIne attenuation curves fof a T1etv0fk according t0 1igure 2. 'he atteT1 uation b of the network is p10tted as a function of the ffequency at different values of the arti f1cial attent12ttion' Cuve I C0rres onds to 0.25

Nepel' i1 the articil] attenuation Curve II COTresp0nds to 0-20 Nepef in the atificial attenuat10n curve C01-1'es )011ds t0 0(15 Neper in tlle artiCial Lttenuation cul've Iv Corresponds to 0-10 Nepe in the altifici1l attenuation It is a180 00nceivable that the quadrip0le nlay consist of a S0 ca11ed negave attter111ation, i e an anp1iier. Such an aTrangen1ent !T1ay be suitable for instance if it is desired t0 Send hgh frequency Signa1s over a telephone line provided With an1p1iflers Without said Signals disturbing the 10W freqllent telephone conversations or otherwise ini11encing the a1T1plif1ers Each anl plier is then atrranged Sin1ilarly to the quadri pole A in a network according t0 the invention t a Suitable ditnensioning of the network the 10W frequencies Within he voice frequency range Xvil1 pass through the a!np1iflers in the usua1 IT1aT1- nel' Whereas the high frequencies above the voice f1`equency range Wi11pass by the anp1ieTS c1ain1:

1. `n e1ectTica1 netvvork particularly fo1` the `e1in1i!1ation of 1inear distortion in telephone lines,

comprising a quadripole netw0Tk having a' cer tain attenuation and being inserted in one line branch by Ineans of one input tern1ina1 and the corresponding output tern1ina1) and c respec tively) two c0ils (1T2) inserted in the saIne line bTanch at opp0site Sides of the quadrip01e and coupled together inductively, and a bridging condenser (C Shunted across the coils and the inte1-- mediate part of the quadrip01e, the Temaining tern1inals (b, (Z) Of the quadrip01e being connected to the opposite line branch` 2. An e1ectical network as c1aimed in claim 1,

- preferably adapted to characterized in that the tern1inals (b, (Z) of the quadripole are nlutua11y shOrtcircuited and directly connected t0 the cor):espondjng 1ine branc11.

3. An e1ecrica1 netwOk particu1arly f0 elimjnat0n Of linear distortion in te1ephone1ines, con1- prising a quadrip0le network having a certauin attenuation, said network being inseTted in one line branch by nleans of one input terIninal and the corresponding output terminal and in the other line branch by Ineans of its two other ter Tninals, a pair of c0i1s in each line branch, the

' coi1s of each pair being insefted at opp0site sides of the quadripole and coupled gether induc tively, ad one bridging condenser shunted across each air of coi1s and the inen1ediate part of the quadripole 4. An electrica1 T1etvw0fk as claimed in claiIn 3 characterized in that the pairs of coils (T,T2) and (T-J3, T l4) Te8pectively, Which are inserted each in one line branch, are wound on a con1!non iron core 5 An electrica1 network as c1ained in c1ailT1 1, chaacerized in that the quadrip0le conSists of an articia1attenuati0n device (I) composed of Series Tesistances and shunt resistances and be adjusted, for instance by varying the nun1ber of 1inks 6- An electrica1 netWO1 k as Clairned i1 l c1ain 1, chaacterized in that the quadrip01e consists of an aricia1 1ine (...l) peferab1y conlposed of Series inductances and Shunt condensers '7. An electrica1 network as claimed in claim 1 characterized in that the quadrip01e consists of a' cOlT1binaiOn Of an artificia1 attenuation device and an attenuat10n1ess articiaI line.

8. An e1ectrical network as claiTned in clailT1 1 characterized in that the quadrip01e has a negative attenuation TORBERN LAURENT 

